SPIRIT OF GOOD BOOKS. 
363 
" The manner in -uhich they have been fashioned appears to have been by 
, blows from a rounded pebble mounted as a hammer, administered directly upon 
the edge of the implements, so as to strike off flakes on either side. At all 
j events I have by this means reproduced' some of the forms in flint, and the 
I edges of the implement thns made present precisely the same character of 
fracture as those from the drift. 
Oval-shaped flint implement from the valley of the Somme. 
" In instances where (either from having been left accidently unfinished, or 
from never having been intended to be ground) the weapons of the Stone 
period have remained in their rough-hewn state, it will be observed that, with 
very few exceptions, they are chipped out with a greater nicety and accuracy, 
